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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 72 (number) ： ウィキペディア英語版 72 (number) 72 (seventy-two) is the natural number following 71 and preceding 73. It is half a gross or 6 dozen (i.e., 60 in duodecimal). ==In mathematics== Seventy-two is the sum of four consecutive primes (13 + 17 + 19 + 23), as well as the sum of six consecutive primes (5 + 7 + 11 + 13 + 17 + 19). The product of 8 and 9, 72 is a pronic number. The sum of Euler's totient function φ(''x'') over the first fifteen integers is 72. There are 17 solutions to the equation φ(''x'') = 72, more than any integer below 72, making it a highly totient number. 72 is the smallest number whose fifth power is the sum of five smaller fifth powers: 195 + 435 + 465 + 475 + 675 = 725. The sum of the eighth row of Lozanić's triangle is 72. In a plane, the exterior angles of a regular pentagon measure 72 degrees each. In base 10, the number 72 is a Harshad number. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「72 (number)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.